For each pin, you will either have to click the 'Override' checkbox and then change the configuration using the drop-down list, or leave the pin alone if the right configuration is already set.On the right-hand side of the hdajackretask window, click on the checkbox 'Show unconnected pins'.At the 'Select a codec' drop-down list, choose Realtek ALC245.Run sudo apt-get install alsa-tools alsa-tools-gui.To summarize, the steps for fixing the Bang & Olufsen speakers is as follows: I've typed out these settings here in case the screenshot in their answer is no longer available. However, I had to use the exact same settings they had in their screenshot, and not only the ones they mentioned in the text of their answer. I'm running Ubuntu 20.04.4 on a HP ENVY 16-inch laptop that I purchased in August 2022. UPDATE: Before trying my solution below, see a (probably better) answer here. It doesn't appear HP is willing to do it. Hopefully someone will reverse-engineer the Windows driver for Bang & Olufsen and create one for Linux. You can read all about it in the 91 comments but I just wanted to summarize it for you. After rebooting into Linux poking in some register configuration values is required. This 'tricks' the amplifier to being powered on. The most successful band-aid to date requires installing a windows update and rebooting into Linux. Like your system there are two front speakers powered from motherboard and two back speakers powered by separate amplifier. I suggest you subscribe to the bug report and keep abreast of bug fixes / work arounds. There are various band-aid approaches people have tried. There are 91 comments posted from Novemup to yesterday (August 12, 2017). HP Spectre x360 (Kabylake) just front speakers work.I did a little more digging and found this bug report: How to install Bang and Olufsen Audio drivers for HP laptop?.He did reference another question here in Ask Ubuntu: The so-called 'HP Expert' there said it's like trying to put a jet engine in a car and make it fly like an AirBus A380. How to install Bang and Olufsen Audio drivers on Ubuntu 16.04.This is no longer true but left her for posterity purposes. The link is included so people are apprised of updates to this issue. There is a new answer with a comment confirming it works.

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